From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 231D3C6FD1D for ; Thu, 23 Mar 2023 14:51:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231923AbjCWOvn (ORCPT ); Thu, 23 Mar 2023 10:51:43 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56104 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231889AbjCWOvl (ORCPT ); Thu, 23 Mar 2023 10:51:41 -0400 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id F3D3F28D3D; Thu, 23 Mar 2023 07:51:11 -0700 (PDT) Date: Thu, 23 Mar 2023 15:50:57 +0100 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1679583058; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=S5o2MPXJCgFIgnNJKhtXeeNCN/6hD2P+cFhnX3GBZmc=; b=OWWXL3V4K1U7BYpFn2T+xGugKbT3cIzYhRDF0dAzTbZhF+pcCjOIlpsnqtYYewDR1TA8Io P7yQ5ULX6x2E8dqtySjAEz1xw6uXh+9hjsHwFZjOQY96mZRPBax5HXxdNP7jjtxyo1CIpB bBM0lAHTnzqDadg6trHyu5LtS1YrJICTr8GX7WLA6OxshoVdJpJEf/dZo7zYLgazB7bXkU tTqWbVnao6CSYLi5eRORYhOLmtPLeJcrQrvfwvpjNIyb/7y/8zJU0xNJ3/Uwb90BpDxP+p mCCcfzmSOKLrv0dvY7dFzz44GpoMMYh26oWlwIDAMWV32mhPuIhwymN3oGMnBA== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1679583058; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=S5o2MPXJCgFIgnNJKhtXeeNCN/6hD2P+cFhnX3GBZmc=; b=AeXjS6AH+AICM0G/kBylrFf3FGaWq5lZLafjGPDlHHklwTBNCVD30KIXy+ECkZOYTX0Dic hwr0pG61UwMYs7CQ== From: Sebastian Andrzej Siewior To: Crystal Wood Cc: Thomas Gleixner , John Keeping , linux-rt-users@vger.kernel.org, linux-kernel@vger.kernel.org, Peter Zijlstra Subject: Re: rtmutex, pi_blocked_on, and blk_flush_plug() Message-ID: <20230323145057.CNQ_eJce@linutronix.de> References: <4b4ab374d3e24e6ea8df5cadc4297619a6d945af.camel@redhat.com> <87k00cr7ix.ffs@tglx> <874jrgqjsw.ffs@tglx> <84c1de84ac129de7c7597c48d3ec19ccc0672492.camel@redhat.com> <20230322164130.CmC_J49n@linutronix.de> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20230322164130.CmC_J49n@linutronix.de> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2023-03-22 17:41:31 [+0100], To Crystal Wood wrote: > On 2023-03-04 23:39:57 [-0600], Crystal Wood wrote: > > Are there any workloads I could run to stress out that path (with my > > asserts in place)? > > None that I can think of. Maybe something from the io-ring test suite. > But then you may need to bend to code to get the task_add() to fail. > Maybe Jens knows something. quick question: Can you throw your testing on the patch I sent checking if this really cures the problem you see? > > -Scott Sebastian